I have an 8 mos old Oranda that has seemed healthy and happy until this week. I've noticed lately him laying in the live plants in his tank or on the bottom of the tank on the gravel sitting motionless as if he is sleeping. When I touch the glass he acts as if he has just been awakend and zips around the tank like normal. Other than this he seems very healthy. It seems to be happening more and more frequently. I do regular water changes (20 - 25%) and feed him 2x per day either flake, peas or pellets.

Has anyone seen this behavior before?? I'm so worried he is going to die.

Can you list the tank size and water parameters (ammonia, nitrite, nitrate, and pH)?

Staying at the bottom of the tank motionless is not normal behavior for goldfish. A healthy goldfish is very active and likes to swim a lot. Do you notice any sores or bruises on him, white spots, fin rot, etc. .. If your water quality checks out fine, i would try to look for any sign of diseases or parasites on him. Have you introduced any plants or new fish into the tank recently?

You must answer Nabi's questions so we can help you out because that is not good behaviour at all unfortunately. Once you've sorted out that out, you should add a bit more variety to his diet such as different types of vegetables and fruits (lettuce, spinach, broccoli, pears, strawberries, etc), frozen or dried live foods (blood worms, brine shrimp, etc) and other fish you can get such as I fed my fish algae wafers intended for bottom dwelling fish and they both love them

Yes, I agree with the rest here.Even if your water readings show the slightest bit of nitrites, it can really stress out the fish.Sitting at the bottom usually is a sign of stress...that your fish just isn't feeling well.The best thing you can do for your fish is do regular water testing along with regular water changes!

Not to mention that your water changes are far too small d: The nitrates are constantly building up in an aquarium, and all you do with 20% changes is diluting the waste solution. You should absolutely go for 50% a week, better with more fresh water for your fish